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ZL3AI > APRDIG 25.07.03 08:54l 239 Lines 9522 Bytes #999 (0) @ WW
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Subj: TAPR Digest, Jul 22, 5/7
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From: ZL3AI@ZL3VML.#80.NZL.OC
To : APRDIG@WW
Subject: Re: Running aprs in the car with a laptop
From: Dave VanHorn <dvanhorn@cedar.net>
Date: Tue, 22 Jul 2003 17:47:21 -0500
X-Message-Number: 32
At 09:35 PM 7/23/2003 +1000, Andrew VK4TEC wrote:
>Does anyone run a laptop in the car ?
>
>I would like suggestions. DC-DC converter or inverter ?
DC-DC is more efficient.
I use an inverter and the laptop's power pack,which itself is a DC-DC
converter, but it's input voltage is 175 VDC .
I always bring the regular power pack along anyway, and having a 110V
inverter in the car is also a plus.
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Subject: Re: aprs2.net Tier 2 Update
From: "AE5PL Lists" <HamLists@ametx.com>
Date: Tue, 22 Jul 2003 18:17:52 -0500
X-Message-Number: 33
>-----Original Message-----
>From: Steve Dimse [mailto:k4hg@tapr.org]
>Posted At: Tuesday, July 22, 2003 5:27 PM
>Subject: [aprssig] Re: aprs2.net Tier 2 Update
>
>No flaw. MOST people want to see all the data on the APRS
>Internet System. A central tenet of Bob's APRS design, which
>I carried over to the Internet System, was that the user
>should always be able to "read the mail" in the finest
>amateur tradition. Nothing should be hidden or made
>inaccessible to the user.
The combination tiered/core network we have today does not preclude
this. Your emphatic statement that "MOST people want to see all of the
data on the APRS Internet System" may or may not be true. You accused
Phil of making "vague accusations". I challenge you to support this
statement. Please remember to include all of the CW operations, as
well.
>javAPRSFilter is availale for those who have bandwidth
>limitations, but most hams still want to look at the full
>stream. The full stream, as bulky as it is, is under 10 kbps,
>athird of a 28k dial-up line. The FUD that the stream
>bandwidth is too much to handle is untrue.
Actually, the bandwidth (due to TCP/IP overhead and the near real-time
implementation of APRS-IS) is closer to 20k average with peaks often
exceeding 28k. Hence, this is why a T1 can only reliably support about
60 full feeds.
This post is not endorsing either method over the other. Personally, I
think both have their place and can and do work together. The core
design is great for ensuring full data passage to all of the network.
Adding specialized second tier servers provides a niche that is
obviously heavily used judging from the number of connections to the
tier 2 servers and the proliferation of many different types of tier 2
servers.
Based on my background in network design combined with my detailed
monitoring of the APRS-IS data stream over the past years, concern about
2 vs. 4 servers in an Internet path is not well founded. Other factors,
such as servers using multiple bidirectional connections to multiple
other servers or bandwidth throttling at the ISP, are far more likely to
cause problems than the addition of specialized second tier servers.
73,
Pete Loveall AE5PL
pete@ae5pl.net
----------------------------------------------------------------------
Subject: Re: aprs2.net Tier 2 Update
From: "Dick Stanich" <dick@kb7zva.com>
Date: Tue, 22 Jul 2003 18:20:43
X-Message-Number: 34
Steve,
<snip>
javAPRSFilter is availale for those who have bandwidth limitations, but
most hams still want to look at the full stream. The full stream, as bulky
as it is, is under 10 kbps, a third of a 28k dial-up line. The FUD that the
stream bandwidth is too much to handle is untrue.
</snip>
It's much closer to 12k. Most hams use their computers for other internet
services and that's when they are going to run into bandwidth issues. If
they are connected to a core server with a dial-up connect, and do little
else, Yes... they might stay connected a little longer. However, if a
server detects they are falling behind in receiving the full feed. They
will be dumped. If queue build-up times exceed 15 seconds, the connection
to that server will be terminated.
<snip>
The numbers I present here are verifiable, the monitoring automatic, anyone
wishing is free to view this at any time. Unlike your vague accusations of
unreliability, I'm presenting facts.
</snip>
I don't think Phil was being vague about anything. SECOND has been up and
running continuous for more than 55 days. Yet, the longest connected user
has only been there for 2 days. FIRST has been up for 12 days and only 1
user has managed to stay connected for the same time period. FOURTH has
been up 5 days, and 2 users have been there as long.
It would seem users for one reason or another can't stay connected. Users
stay connected longer to non-core servers, where they don't need the full
feed.
I'd take a serious look at the reason why so many hams have migrated to the
tiering concept. For years, the Core Servers provided us with the only
means to use the APRS-IS. Far more hams are finding that they don't want or
even need the full feed. They decided to use Tier 2 servers because of
choice, nothing else. It would be difficult today, to tell them that they
are all wrong about THEIR choice. I'd rather present the facts and let them
use what they want.
<snip>
And, just for the record, the APRS IS Core was set up by people 7 years
ago, many years before there were people advocting a Tier 2 network.
</snip>
With due respect, so what? I no longer own the first radio I bought. It was
replaced by something I just couldn't live without. Things change. It's not
a matter of hams using the core servers or Tier 2 servers. It's choice.
I'll put my money on the triering concept, because I'm less critical about
how things 'were supposed to work'. It didn't happen.
Dick, KB7ZVA
arizona.aprs2.net
aprswest.net
----------------------------------------------------------------------
Subject: Re: Running aprs in the car with a laptop
From: "Gregg G. Wonderly" <gregg@skymaster.cytetech.com>
Date: Tue, 22 Jul 2003 18:27:25 -0500
X-Message-Number: 35
>Oh, on the power question. I use vrious device adapaters that connect
>to the dedicated power port in my Ford Escape, which is always on.
>Newer cars have them, I have one in the back too, older cars may not
>have them.I also use the lighter adapter.
I bought and installed the 8 connector Chassis Mount Housing powerpole
connector device shown at http://www.powerwerx.com/category.asp?CtgID=1681.
I have the inverter plugged into one pair, the TH-D7 into another, the
GPS into the third and the 4th pair is open. I plug an ATV transmitter
into the 4th when I am ATV mobile. I carry a 5-way splitter cable to
convert that 4th outlet into 4 more if I need some for low power things.
I also have a 20ft 12gauge patch cord, and adapter cables for crimp on
battery connectors, lighter plug and lugs. The feed wire at the battery
includes a connector there so that I can eliminate by battery from the
circuit if I want to power off another source.
This is extremely flexible, and has proven itself repeatedly in letting
me get power to my stuff without having to solder, crimp or patch!
The housing is fed by 10 gauge wire from the battery, with double fuses.
It has a 2-way split of 10 Gauge and then a second 2-way split on
each leg. Each +/- pair in the housing is thus fed by 12 gauge wire.
Positive and negative are both split, below is an example of one leg.
Double lines are 10 gauge, single are 12 gauge. It is easier to get 12
gauge into the powerpoles than 10 gauge, so I went down one gauge to get
into the powerpoles.
=============___________
\\ \
\\ \
\\ ---------
||
||
||
----------------
\
\
-------------
-----
gregg@cytetech.com (Cyte Technologies Inc)
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Subject: Re: aprssig digest: July 21, 2003
From: "Ron" <rgilson@adelphia.net>
Date: Tue, 22 Jul 2003 19:43:53 -0400
X-Message-Number: 36
Any one out there in APRS land got a source of a swinging supply 12vdc to 6
vdc. I would like to get rid of my 7805 and replace it with an isolated and
more efficient regulated supply. I need about 100ma at 5 to 6 vdc.
Isolation would overcome ground loops etc and some thing in the 50 ma range
input allows 24hr mobile operation. Am I missing any thing like
interference to low band or my AM car radio??? Tnx
Ron Gilson
WA2WWK
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Subject: Re: Running aprs in the car with a laptop
From: "Mark Fellhauer" <sparkfel@qwest.net>
Date: Tue, 22 Jul 2003 19:17:26 -0500
X-Message-Number: 37
At 06:27 PM 7/22/2003, Gregg G. Wonderly wrote:
>I bought and installed the 8 connector Chassis Mount Housing powerpole
>connector device shown at http://www.powerwerx.com/category.asp?CtgID=1681.
I used the dual conductor Chassis Mount in my car mounted in a small Radio
Shack project box mounted on the pax side central tunnel - double fused at
the battery. The only thing I noticed is that the Anderson mounts want you
to link all the connectors together, but you can to skew them slightly
(unconnected) and still fit. I also have a PowerPole pigtailed behind the
driver's seat and one in the luggage compartment...
I recently had a chance to play with a few RIGrunners from West Mountain
Radio (as seen on the PowerWerx website too). Pricey, but very well made.
73,
Mark
KC7BXS
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